I have query about the discharge of Service Tax Liability period prior to 01.04.2008. We have received the notice from the dept for payment of service tax liability for old period 2006-07 & 2007-08. We have a balance of Cenvat Credit in books. Can we discharge this liability through cenvat utilisation of 100% or by 20-80%. i.e 20% by cenvat and 80% by cash.Pls advice.